In Exchange 2010, Personal Archive allows you to provide users with an alternate storage location to store historical messaging data. Users have seamless access to their archive mailbox using Outlook 2010 and Outlook Web App. Using either of these client applications, users can view an archive mailbox and move or copy messages between their primary mailbox and the archive. Personal archive allows you to present a consistent view of messaging data to users, and eliminate user overhead required to manage PST files.